AirHint found the following cheapest return flights from Washington (IAD) to Cancun (CUN) in December 2025 (see full year).

Return flights

01 Dec - 04 Dec	United	direct
02 Dec - 05 Dec	United	direct
13 Dec - 20 Dec	United
05 Dec - 07 Dec	Frontier Airlines
04 Dec - 07 Dec	Avianca
04 Dec - 08 Dec	Aeromexico
11 Dec - 14 Dec	Air Canada
18 Dec - 25 Dec	Frontier Airlines
11 Dec - 14 Dec	United	direct
18 Dec - 21 Dec	United
28 Dec - 02 Jan	Aeromexico
29 Dec - 03 Jan	Aeromexico
24 Dec - 01 Jan	Delta
27 Dec - 02 Jan	Avianca
27 Dec - 03 Jan	Southwest Airlines

Also check the deals for one-way flights from Washington to Cancun in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to Cancun in December from 215€

Return flights